I would determine a retail price based on condition and then pay half that.
For example, if the cards have a book price of $10K, but are in Ex/Mt condition (I generally price Ex/Mt cards @ 50-60% of BV), then the retail price would be $5K-$6K. Let’s split it and just say $5500. Then I would be willing to pay half that, which is $2750.
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